Once again, you gave me the knowledge. First with the racquet stiffness information. Now with the Pro Penn marathon balls.

We love them. Filled the 120 ball basket with them. Used them for rallies on both Har Tru and hard courts. Comfortable to hit, lively, perfect.

My girl went with a Babolat 60 stiffness racquet, comfortable strings, and the Pro Penn Marathon balls and has never hit with more power yet control, and her arm does not tire on her even after a lot of serve practice.

Thanks again!

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Hey TCF,
how do the Penn Marathons compare to regular wilsons? I use wilsons on hard and babolat on har tru in the hopper with my kid.